ORACLE SQL:如果存在,則更新,否則插入 (ORACLE SQL : IF EXISTS UPDATE ELSE INSERT) 讓我們說: 我在OracleDb 上有數據,就像我上面提到的那樣。 TRANSFERNUMBER| VALUE1 | VALUE22250| 1000 | 20002251| 1000 | 3000 我的主要目的是在表上添加一些數據時,如果數據存在,它應該更新數據。如果表上不存在數據,則...
语法介绍 像上面这样的例子如果在SQL里面实现会非常简单 if exists(select 1 from T where T.a='1001' )updateT set T.b=2 Where...T.a='1001' elseinsertinto T(a,b) values('1001',2); 而在Oracle里面要用到Merge into来实现(Oracle9i引入的功能),其语法如下...判断temp_cstable表里的incode与...
when (not exists(select * from table1 where id=1)) then into table1 select 1 as id, 'a' as data from dual; - 再比如以下的代码 if not exists(select * from table1 where id=2) insert into table1 values(2,'b') else update table1 set data='b' where id=2; 可以改写成 merge i...
通常我们使用if(exists(select ...)update...else insert,这样进行两遍表扫描,效率很低,在Oracle 9i以上有一个关键字merge,我们使用它就可以了。merge into 需要两个标操作,我们利用dual merge into referer_stat L using (select '1' from dual) N on (L.webid=234) WHEN MATCHED THEN UPDATE set count...
when (not exists(select * from table1 where id=1)) then into table1 select 1 as id, 'a' as data from dual; - 再比如以下的代码 if not exists(select * from table1 where id=2) insert into table1 values(2,'b') else update table1 set data='b' where id=2; ...
insert when (not exists(select * from table1 where id=1)) then into table1 select 1 as id, 'a' as data from dual;- 再比如以下的代码 if not exists(select * from table1 where id=2)insert into table1 values(2,'b')else update table1 set data='b' where id=2;可以...
Postgres Insert if not exists,Update if exists on non unique列? Sql select with Not exists 如何更新if exists或insert Insert if not exists触发器 在IF子句Oracle中执行select/insert语句 insert into select MySQL - select内部选择和use NOT EXISTS ...
3) 两表(多表)关联update -- 被修改值由另一个表运算而来 update customers a -- 使用别名 set city_name=(select b.city_name from tmp_cust_city b where b.customer_id=a.customer_id) where exists (select 1 from tmp_cust_city b
drop table if exists test_time_auto_update; create table test_time_auto_update ( id bigint auto_increment primary key comment '自增id', name varchar(8) comment '姓名', datetime1 datetime default current_timestamp comment 'insert 时,更新时间', ...
SET tgt.object_name = src.object_name //update it , tgt.object_type = src.object_type WHEN NOT MATCHED // if not exists THEN INSERT ( tgt.object_id //then insert , tgt.object_name , tgt.object_type ) VALUES ( src.object_id , src....